橋梁拉吊索用高強(qiáng)不銹鋼絲力學(xué)性能試驗研究
發(fā)布時間：2018-11-04 11:12
【摘要】：拉吊索用鋼絲的銹蝕問題一直是橋梁工程中的技術(shù)難題,特別是在以斜拉橋、懸索橋等組合體系橋被廣泛使用的今天。作為該類橋型結(jié)構(gòu)中的主要承重構(gòu)件,拉吊索的重要性不言而喻。但是,由于環(huán)境和荷載的長期作用,再加上拉吊索始終處在高應(yīng)力狀態(tài),其銹蝕和斷裂問題一直是橋梁工程中的重大安全隱患。橋梁拉吊索用鋼絲(鋼絞線)的常規(guī)防護(hù)工藝很難從根本上解決拉吊索的銹蝕問題,而將拉吊索用高強(qiáng)鋼絲更換為高強(qiáng)不銹鋼絲的方法正在逐漸被業(yè)界認(rèn)可。將不銹鋼絲作為橋梁拉吊索制備的原材料,可以從根本上解決其銹蝕問題,從而為橋梁建設(shè)的長期健康發(fā)展提供幫助。作為橋梁拉吊索的制備原材料,不銹鋼絲在滿足必要不銹性、耐腐蝕性的前提下,還應(yīng)具有優(yōu)異的力學(xué)性能。為此,本文開展了不銹鋼絲力學(xué)性能的試驗研究,主要研究內(nèi)容和結(jié)論如下:(1)系統(tǒng)總結(jié)了不銹鋼絲力學(xué)性能的影響因素,包括材料的化學(xué)成份、模具和潤滑條件、拉拔速率和溫度、拉拔道次和面減率、預(yù)加反拉力、熱處理時間和熱處理溫度以及退火時間等;(2)對不同拉拔道次、面減率和熱處理溫度的不銹鋼絲進(jìn)行室溫拉伸試驗,測出抗拉強(qiáng)度、屈服強(qiáng)度和斷后延伸率等力學(xué)性能指標(biāo)并進(jìn)行比較,得出如下結(jié)論:隨著拉拔道次的增加,不銹鋼絲的抗拉強(qiáng)度和屈服強(qiáng)度增大,而斷后延伸率減小;對不銹鋼絲進(jìn)行熱處理,會提高其抗拉強(qiáng)度和屈服強(qiáng)度,而減小其斷后延伸率;(3)對不銹鋼絲室溫拉伸試驗結(jié)果的影響因素進(jìn)行了分析,結(jié)果表明:隨著試驗機(jī)拉伸速率的增加,不銹鋼絲的強(qiáng)度和彈性模量增大,而在斷后延伸率的變化趨勢方面,拉伸速率的改變未能對不銹鋼絲造成規(guī)律性的影響;(4)對不銹鋼絲進(jìn)行軸向等幅低循環(huán)疲勞試驗,多組試樣的疲勞試驗次數(shù)都超過了400萬次,但依然存在疲勞次數(shù)未達(dá)到規(guī)范要求(200萬次)的試樣,說明試樣的質(zhì)量穩(wěn)定性仍需改進(jìn);(5)對不銹鋼絲進(jìn)行了100h松弛性能試驗,并對1000h松弛率進(jìn)行了推算,得出計算機(jī)推算的1000h松弛率與線性回歸分析推算值基本一致,可以反映試樣的松弛性能。
[Abstract]:The problem of steel wire corrosion for slings has always been a technical problem in bridge engineering, especially in the cable-stayed bridge, suspension bridge and other composite system bridges are widely used today. As the main load-bearing member of this kind of bridge structure, the importance of the sling is self-evident. However, due to the long-term effect of environment and load, and the tension sling is always in the state of high stress, the corrosion and fracture problems have always been a major safety hazard in bridge engineering. The conventional protection technology of steel wire (steel strand) for bridge sling is very difficult to solve the problem of rust fundamentally. However, the method of replacing high strength steel wire with high strength steel wire is gradually accepted by the industry. Using stainless steel wire as the raw material of bridge sling can fundamentally solve the problem of corrosion and provide help for the long term healthy development of bridge construction. As the raw material for the preparation of bridge sling, stainless steel wire should also have excellent mechanical properties under the prerequisite of satisfying the necessary rust and corrosion resistance. The main contents and conclusions are as follows: (1) the factors affecting the mechanical properties of stainless steel wire, including the chemical composition of the material, die and lubrication conditions, are systematically summarized. Drawing rate and temperature, drawing subgrade and surface reducing rate, pretension, heat treatment time and heat treatment temperature, annealing time, etc. (2) tensile test at room temperature was carried out on stainless steel wire with different drawing passes, surface reduction rate and heat treatment temperature. Tensile strength, yield strength and elongation after break were measured and compared. The following conclusions are drawn: with the increase of drawing pass, the tensile strength and yield strength of stainless steel wire increase, while the elongation after break decreases; The tensile strength and yield strength of stainless steel wire can be increased by heat treatment, and the elongation after breaking will be reduced. (3) the factors influencing the tensile test results of stainless steel wire at room temperature are analyzed. The results show that the tensile strength and elastic modulus of stainless steel wire increase with the increase of tensile rate of the tester, but the trend of elongation after breaking increases. The change of tensile rate does not have a regular effect on stainless steel wire. (4) the fatigue test of stainless steel wire with equal amplitude and low cycle is carried out. The fatigue test times of many groups of specimens exceed 4 million, but there are still samples whose fatigue times do not meet the requirements of the specification (2 million times). It shows that the quality stability of the sample needs to be improved. (5) the 100 h relaxation test of stainless steel wire was carried out, and the 1000 h relaxation rate was calculated. It is concluded that the calculated 1000 h relaxation rate is basically consistent with the linear regression calculation value, which can reflect the relaxation property of the sample.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446
本文編號：2309651
[Abstract]:The problem of steel wire corrosion for slings has always been a technical problem in bridge engineering, especially in the cable-stayed bridge, suspension bridge and other composite system bridges are widely used today. As the main load-bearing member of this kind of bridge structure, the importance of the sling is self-evident. However, due to the long-term effect of environment and load, and the tension sling is always in the state of high stress, the corrosion and fracture problems have always been a major safety hazard in bridge engineering. The conventional protection technology of steel wire (steel strand) for bridge sling is very difficult to solve the problem of rust fundamentally. However, the method of replacing high strength steel wire with high strength steel wire is gradually accepted by the industry. Using stainless steel wire as the raw material of bridge sling can fundamentally solve the problem of corrosion and provide help for the long term healthy development of bridge construction. As the raw material for the preparation of bridge sling, stainless steel wire should also have excellent mechanical properties under the prerequisite of satisfying the necessary rust and corrosion resistance. The main contents and conclusions are as follows: (1) the factors affecting the mechanical properties of stainless steel wire, including the chemical composition of the material, die and lubrication conditions, are systematically summarized. Drawing rate and temperature, drawing subgrade and surface reducing rate, pretension, heat treatment time and heat treatment temperature, annealing time, etc. (2) tensile test at room temperature was carried out on stainless steel wire with different drawing passes, surface reduction rate and heat treatment temperature. Tensile strength, yield strength and elongation after break were measured and compared. The following conclusions are drawn: with the increase of drawing pass, the tensile strength and yield strength of stainless steel wire increase, while the elongation after break decreases; The tensile strength and yield strength of stainless steel wire can be increased by heat treatment, and the elongation after breaking will be reduced. (3) the factors influencing the tensile test results of stainless steel wire at room temperature are analyzed. The results show that the tensile strength and elastic modulus of stainless steel wire increase with the increase of tensile rate of the tester, but the trend of elongation after breaking increases. The change of tensile rate does not have a regular effect on stainless steel wire. (4) the fatigue test of stainless steel wire with equal amplitude and low cycle is carried out. The fatigue test times of many groups of specimens exceed 4 million, but there are still samples whose fatigue times do not meet the requirements of the specification (2 million times). It shows that the quality stability of the sample needs to be improved. (5) the 100 h relaxation test of stainless steel wire was carried out, and the 1000 h relaxation rate was calculated. It is concluded that the calculated 1000 h relaxation rate is basically consistent with the linear regression calculation value, which can reflect the relaxation property of the sample.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446
【引證文獻(xiàn)】
相關(guān)會議論文 前2條
1 徐效謙;;鋼絲索氏體化工藝探討[A];第十屆中國科協(xié)年會論文集（四）[C];2008年
2 尹紅;葉覺明;;超大跨度懸索橋用高強(qiáng)鋼絲和主纜制作及架設(shè)技術(shù)[A];全國金屬制品信息網(wǎng)第22屆年會論文集[C];2010年
，本文編號：2309651
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2309651.html
教材專著
